In Emacs terminology, a "window" is a container in which a [[buffer]] is displayed.

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#REDIRECT [[Emacs Terminology#Window]]

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When starting an Emacs [[frame]], there is ordinarily only one window in it, which can be split into multiple windows using {{Keys|C-x 2}} or {{Keys|C-x 3}}. This allows viewing different [[buffer|buffers]] (or multiple times the same [[buffer]]) at once